Thanks Dave for finding the reference, that the disc where they claimed to sputter the sample film onto, was made from copper.
That video therefore indicates, that it was not done by the scientists themselves.. as they probably would have known about the induction effect.
For proof of SC, you need consistent measurements of resistivity, and magnetic measurements, like my complex susceptibility.
The authors here show a very steep step in resistivity, but a very broad step in the magnetization.
That does not fit together at all, it's unclear why they would have chosen such a relatively high magnetic field H.
An AC susceptibility measurement would have been better for demonstration, as you could compensate for the DC magnetic field of the earth, and you could have chosen a very small probing ac field as of ~ 100nT. Both papers are therefore very badly prepared.
BTW.: The first, Nobel Prize winning paper by Bednorz and Mueller in June 1986 was very carefully titled "Possible high T c superconductivity in the Ba−La−Cu−O system", containing very mediocre resistivity measurements as well.
Frank